189372221 has 8 divisors (see below), whose sum is σ = 200138400. Its totient is φ = 178686000.

The previous prime is 189372203. The next prime is 189372229. The reversal of 189372221 is 122273981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189372221 - 2¹⁰ = 189371197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189372229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15086 + ... + 24623.

It is an arithmetic number, because the mean of its divisors is an integer number (25017300).

Almost surely, 2^189372221 is an apocalyptic number.

It is an amenable number.

189372221 is a deficient number, since it is larger than the sum of its proper divisors (10766179).

189372221 is a wasteful number, since it uses less digits than its factorization.

189372221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39979.

The product of its digits is 12096, while the sum is 35.

The square root of 189372221 is about 13761.2579730198. The cubic root of 189372221 is about 574.2558449042.

The spelling of 189372221 in words is "one hundred eighty-nine million, three hundred seventy-two thousand, two hundred twenty-one".